STEERING, FUEL FILTER, BRAKES

Curious why my steering makes a straining sound when I turn the wheel. Happens more intensely when in parking lots (limited car movement), but also turning corners. Is this a steering pump or maybe a cv joint problem? Fluids were checked and levels are fine.

Also, my rear brakes often grind when I reversing. I had brakes checked and they were fine, power washed them incase dusty. What could this be?

Last, I get a weakened rev (especially when I floor it), would this be fuel filter? Or something else?